bug#44850: 27.1; Emacs crash in font handling with font-backend ns

[Eli Zaretskii]

> From: Mattias Engdegård <mattiase@acm.org>
> Date: Fri, 27 Nov 2020 18:16:48 +0100
> Cc: Eli Zaretskii <eliz@gnu.org>, Alan Third <alan@idiocy.org>,
>         Lars Ingebrigtsen <larsi@gnus.org>, pieter-l@vanoostrum.org,
>         pieter@vanoostrum.org
> 
> > I'd prefer to lift the restriction introduced by doprnt.c, instead of 
> > replacing that character. It isn't clear to me why this restriction is a 
> > good idea, and it doesn't seem like lifting the restriction should be hard.
> 
> Yes, the restriction is a bit odd but perhaps there was a good reason. For 
> this application, however, we could just switch from esprintf to sprintf in 
> nsterm.m. (The stated reason for using esprintf was in case the string is 
> longer than 2 GiB but I think we would have bigger problems if a frame title 
> ever becomes that long.)
> 
> OK for master? (Also fixed the unsightly 'x' while at it)

Like I said: I'd prefer to fix the problem in doprnt.c, rather than
sweep it under the carpet.